#include <stdio.h>
#include <stdlib.h>

struct A {
    int count;
    int arr[];
};
int main()
{
    struct A a = { 0 };
    a.count = 3;
    a.arr[0] = 1;
    a.arr[1] = 2;
    a.arr[2] = 3;

    int count = a.count;
    for (int i = 0; i < count; i ++ )
    {
        printf("%d \n", i);
        a.count ++ ;
    }
    
    return 0;
}
